Device for reboring engine-cylinders.



L. E. DAVIS. I

DEVICE FOR REBORING ENGINE CYLINDERS. APPLICATION FILED JUNE 30.1915.

1 ,1 60,267. Patented Nov. 16, 1915.

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Specification of Letters :Patent.

Patented Nov. 16, 1915.

Application filed June 30, 1915. Serial No. 37,152.

useful Improvements in Devices for Reboring Engine-Cylinders, of which the following is a specification.

On account of the repeated expansion and contraction of gas engine cylinders, due to their heating and cooling in use, the cylinders eventually become somewhat warped so 7 that the pistons do not fit properly therein, which obviously results in a loss of efiiciency. A remedy for this is to rebore the-cylinders, and it has been found that old cylinders which have seen considerable service have become seasoned by the repeated heating and cooling, so that such old cylinders when rebored are in reality superior to new ones.

The object of this invention is to pro duce a deviceby which the cylinders of automobile engines and other engines may be conveniently and accurately rebored. The invention also aims to provide a portable tool of simple and durable construc tion which may be easily associated with a cylinder and may be operated effectively by an unskilled workman.

In the accompanying drawings, Figure 1 is a side elevation of a device embodying the features of my invention, the view also showing'a fragment of an engine to illustrate the manner of associating the device therewith. Fig. 2 is a perspective view of the base of the device.

The preferred embodiment of the inven tion illustrated in the drawings comprises a support 5 which is adapted to be rigidly secured to the end of the engine cylinder A above and concentric with one of the bores This support comprises a base- 6 of annular form which is provided with a suitable number ofopenings 7 adapted to receive cap-screws 8. The end of any engine cylinder has a plurality of screw-threaded holes or'sockets which are intended to receive the bolts by which the head of the cylinder is clamped in place. These same holes are utilized to receive the cap screws 8 by which the base ring 6 is firmly bolted to the cylinder.

-Rising from the base ring 6 is a plurality of uprights 9, in this instance four in number, and at the upper end of these uprights is a vertical bearing sleeve 10 arranged concentric with, the base ring 6. Preferably the base ring 6, the standards 9 and bearing 10 are cast in an integral piece.

A shaft 11 is mounted for rotation and also for movement up and down in the bearing 10. On the lower end of said shaft beneath the bearing is fixed a reamer head 12 of any common or preferred construction. If desired, the reamer may have a conical lower end to facilitate centering the same. The interior diameter of the ring 6 and the spacing of the uprights 9 are suificient to accommodate the reamer head and permit the latter to pass downwardly through these parts and into the bore of the engine cylinder. On the upper end ofthe shaft 11 is fixed a suitable handle 13 for turning the shaft, said handle in the present instance consisting of a bar passing through an opening in the upper end of the shaft and providing oppositely extending radial arms to be grasped by the operator for turning the reamer.

In use, after the head has been removed from the cylinder, the reboring device is set upon the end of the cylinder, the lower end of the reamer head 12 being caused to engage in the upper end of a cylinder bore so as to properly center itself with respect to said bore. The support 5 is then turned until a suitable number of the holes 7 in the base ring register with the screw-thread ed sockets in the cylinder, and cap screws 8 "are then inserted through the holes and turned down tightly in said sockets so that the support is rigidly clamped to the cylinder with the reamer head properly centered to accurately perform its function. The operator turns the reamer head and shaft 11 by means of the handle-bar 13. The spacing of the holes 7 indicated in the drawings is that employed for Ford cylinders, a portion of one of which is indicated at A in Fig. 1.

The device is simple and durable in construction, and it is capable of being easily attached in operative position. Furthermore the device may be attached and operated by any unskilled workman with satisfactory results.

The invention is not limited to the exact form of the embodiment shown in the drawings, but may be modified or varied within A device for reboring engine cylinders characteristics comprising an annular base having a series of holes therethrough adapted to receive fastening members by Which the device is secured to a cylinder, a plurality of uprights rising from said base, an upright bearing carried at the upper ends of said uprights, a shaft rotatable and slidable freely lengthwise in said bearing, a reamer claim Without headrfixed to the lower end of said shaft and adapted to occupy the space defined 15 by said uprights and further adapted to V LOGEE E. A -1s; In the presenceof I H. D. WAGNER, G.'O. DEAN.

Copies of this patent may be obtained for'five cents each, by addressing the Commissioner of Patents.

' Washington, D. C. 

